Electrical condenser



June 1 1926. 1,587,095

l a. R. WEBSTER ELECTRICAL CONDENSER Filed April 28, 1924 Patented June l, 1926.

4UNITE@ STATES PATENT FFCE.

BESTER vIR.. WEBSTER, OF CHICAGO, ILLINOIS, -ASSIGNOR TO RELIANCE DIE & STAMP- ING COMPANY, OF CHICAGO, ILLINOIS, A. CORIORATION OF ILLINOIS.

nLnornroAL coNDENsER.

Application mea April as, 1924.` serial No. 709,513.

Mv invention relates to electric condensers, the condenser of my invention being of particular service when employed in systems of wireless communication, though the condenser of my invention is not to be limited to any particular use thereof.

The invention relates particularly to .those condensers each of whose sides is composed of a group of electrically connected leaves that are alternated with the leaves of the group composing the other side, means being aorded whereby less than the complete number of the `condenser leaves of one side may be adjustable with respect to the remaining yleaves of this side and with respect to the other side of the condenser. In a condenser of this class, the adjustable condenser side had most of its leaves mounted upon a quill shaft and a minor portion of its leaves upon a solid shaft within the quill shaft. The solid shaft had one bearing upon the exterior of the quill-shaft and was also journaled in the bore of the quill shaft. The quill-shaft was journaled in a surrounding bearing and also directly upon the solid shaft. The electrical and mechanical unity of the condenser plates carried by these shafts depended upon the accuracy of their fit7 and the snugness of their fit prevented independence of their adjusting movements, the adjusting movement of one shaft fre'- quently causing an undesired adjusting movement of the other.

In practicing my invention, a sleeve or nut is carried by the solid or inner shaft and serves as a bearing for the adjacent end of the quill shaft that also, in turn, racts as a bearing for the nut7 whereby each shaft rotatably supports the other very closely adjacent the leaf carried by the inner shaft to eliminate the danger of short circuiting the condenser sides at this part of the condenser.v

The invention will be more fully explained in connection with the accompanying drawing in which Fig. l is a side view of a condenser constructed in accordance with the preferred embodiment of the invention, front end portions of the two shafts being broken away;

Fig` 2 is an axial sectional View;

Fig. 3 is a sectional view on line 3-3 of Fig. l; and

Fig. l is an enlarged view vof a part of the structure as it appears in Fig. 2.

The' condenser illustrated includes two mounting plates l and 2 of insulating material which are assembled upon threaded metallic rods 3 by means of nuts 4C. These mounting plates are suitably assembled with the mounting board or panel 5. One of the -condenser sides includes a group of metallic leaves 6 through which the rods 3 pass and which are electrically connected by means of metallic sleeves 7 having slots which receive said leaves 6. The other condenser side includes a group of metallic leaves 8, these leaves being alternated with the leaves of the first group, as illustrated. rlhe condenser side 8 is mounted to be adjustable with respect to the other condenser side, the adjustable group being rotatably supported upon the insulating mounting plates l and 2.

The support for the group of lea-ves 8 which is rotatively mounted in the plates l and 2 is inclusive of a rotatable sleeve or hollow shaft 9 having a fianged knob l() upon the outer end thereof, this knob being provided with scale marks upon its periphery, and being rotatable in front of suitable marking upon panel 5 whereby the extent of rotative movement of the rotatable condenser side carried thereby may readily be determined. The leaves 8 are spaced apart by washers 8. The set screw 9 carried by the collar 92 prevents the hollow or quill shaft 9 from being moved forwardly longitudinally of its axis. The quill shaft is prevented from moving rearwardly toward the plate l as will appear.

Shaft 11 is journaled in the bore of the hollow shaft or sleeve 9. Its front end projects beyond the front of the knob 10 and carries a knob 12 that bears suitable scale marks upon its periphery to cooperate with suitable marking upon the knob. 10 in deiining the extent of the refining adjustment of theV inner shaft with respect to the hollow shaft.

The condenser plate 13 belongs to the adjustable condenser side and supplements the pla-tes 8. It is mounted upon the shaft 1l,

that passes therethrough, by rneans of nuts 14 15 threaded upon this shaft and between which this supplemental condenser plate is clamped so as to turn with this shaft. A washer 16 is pressed in frictional contact with the shoulder upon the adjacent end of the quill shatt- 9 by the adjacent nut or .sleeve 15. rlhis washer is tornicd with a tail 17 which engages rod 172 whereby the washer is held troni rotation, and serves as a brake to prevent either shaft 9 or 11 troni being turned by the other. The washer also serves to maintain electrical unity between the two relatively adjustable parts of the rotatable condenser side and to prevent rearward inoveinent ot the quill shaft 9. The inner shaft 11 is extended` rearwardly beyond the outer shaft 9 and projects through and beyond the rear mounting plate 1 in which it niay be journaled, ir" desired.

Friction between the stationary washer 16 and the adjacent nut 15, and adjacent collar S may be maintained in any suitable way. I have indicated a leaf spring 18 for this purpose, this spring being anchored at one end, to the plate 1 by the screw 19 and being ust-ably pressed at its other end upon the rear end ot shaft 11 by an adjusting screw 2O entering` the plate 1.

rEhe journal 21 for the front end of the quill shaft inay be externally conical to tit a conical opening in the plate 2.

lt is obvious that changes may be inade without departing 'troni iny invention.

Having thus described iny invention, l claim:-

In an electric condenser, the combination with one group ot' electrically connected leaves constituting one condenser side; ol a second group of electrically connected leaves alternated with the leaves ot' the first group and constituting the other condenser side; a rotatable quill-shaft carrying al portion ot the leaves ot one group; an inner shaft passing through the bore of the quill-shaft and carrying a leaf ot the latter group; a sleeve assembled with the inner shaft and receiving and turning upon one end of' the quill-shaft which has a cylindrical end portion that turns upon and within this sleeve, one end of said inner shaftpassing through and projecting beyond said sleeve; a bearing for said projecting end of the inner shaft; and a bearing for the quill-shaft.

1n witness whereof, I hereunto subscribe my naine.

BESTER R. WEBSTER. 

